1st it is NOT my wallet, I am only using it. (My main wallet still is hardware wallet)

2nd You are totally wrong... it is not brainwallet at all.

3rd You probably use many things that are closed source everyday, maybe Iphone or other things,
so if you want to be consistent then stop using any closed source like Windows, Iphone, iTunes, Adobe, macOS ...
Btw... I do agree that Opensource is better, but it is not perfect